An image encryption algorithm based on hyperchaotic system and DNA coding

A chaotic image encryption scheme combining block scrambling and DNA coding is proposed. The chaotic sequences generated by Chen hyperchaotic system are used for inter-block index scrambling and intra-block FisherYates scrambling. Then the index sequence is used to further scramble the image to further enhance the encryption effect. The pixel value of the image is initially changed by chaotic sequence, and diffused by different DNA coding rules and different operation rules corresponding to chaotic sequence. After decoding the DNA matrix, the final encrypted image is obtained. The initial values and parameters of the chaotic system are generated by SHA-512 hash function and plaintext image. The experimental results and various security analysis show that the algorithm has good encryption effect and can resist common attacks such as chosen-plaintext attacks, clipping attacks and noise attacks.

Automated summary

The chaotic image encryption scheme combines block scrambling and DNA coding to achieve encryption. By changing pixel values, scrambling image indexes, and using DNA coding rules, the algorithm demonstrates good encryption effect and resistance to common attacks.